CVEs-PoC/2020/CVE-2020-36221.md

### [CVE-2020-36221](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36221)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

An integer underflow was discovered in OpenLDAP before 2.4.57 leading to slapd crashes in the Certificate Exact Assertion processing, resulting in denial of service (schema_init.c serialNumberAndIssuerCheck).

### POC

#### Reference
- http://seclists.org/fulldisclosure/2021/May/64
- http://seclists.org/fulldisclosure/2021/May/65

#### Github
- https://github.com/ARPSyndicate/cvemon